Symfony achieves 100% PHP7 compatibility

PHP7, the new version of the programming language Symfony is built with, will be
released at the end of the year. The recent release of its third beta has brought us another step closer to the final stable release.

During these last past months, we've been working very hard to achieve full PHP7
compatibility. This effort accelerated during the past weeks and we're glad to
announce that all Symfony maintained branches are now 100% compatible with PHP7.

Our PHP7 compatibility journey started on February 2015, when Nicolas Grekas
added php: nightly to the list of tested PHP engines on Travis CI
(see commit).
After that, a lot of pull requests
followed to fix PHP7 compatibility for Symfony components.

Some of these changes were related to the new reserved keywords, which prevents
you from using int, float, bool, string, true, false and
null as the name of your classes (see PR #14472).
This forced us to rename the Null, True and False constraints
(see PR #14228).

Another big change was related to the new Throwable interface introduced by
PHP7 and which is implemented by all the internal error and exception classes.
Our exception handler needed to be updated for this new interface
(see PR #14959).

Lastly, we've just removed php: nightly from the list of PHP engines which
can silently fail. This means that Symfony no longer accepts changes that break
PHP7 compatibility, not even in the master branch where the upcoming Symfony 3
is being developed.

It's 100% php7 compatibility on test suite with BC on 2.X for some classes to be precise. It's a good announcement but as far as I know, all others projects that depend on Symfony are *not* PHP7 compatibles, for instance we have some issues with HTTP Foundation in BackBee. This announcement may be too optimistic in my opinion...